test(io): cover deep eval serialization in consistent io

Assert in the consistent IO deep-eval test that DeepEval.serialize() returns the same model tree as the backend serialize hook payload. This keeps the new serialize semantics covered in the shared cross-backend IO test.

Authored by OpenClaw (model: gpt-5.4)

Author: njzjz-bot

source/tests/consistent/io/test_io.py

@@ -156,11 +156,12 @@ def test_deep_eval(self) -> None:
             if not backend.is_available():
                 continue
             reference_data = copy.deepcopy(self.data)
-            self.save_data_to_model(
-                prefix + backend.suffixes[suffix_idx], reference_data
-            )
-            deep_eval = DeepEval(prefix + backend.suffixes[suffix_idx])
+            model_file = prefix + backend.suffixes[suffix_idx]
+            self.save_data_to_model(model_file, reference_data)
+            deep_eval = DeepEval(model_file)
             self.assertIsInstance(deep_eval.get_model_def_script(), dict)
+            serialized_data = self.get_data_from_model(model_file)
+            self.assertEqual(deep_eval.serialize(), serialized_data["model"])
             if deep_eval.get_dim_fparam() > 0:
                 fparam = np.ones((nframes, deep_eval.get_dim_fparam()))
             else: